1. Loose or damaged gas cap: If the gas cap is not securely tightened or is damaged, it can cause the check gas cap light to illuminate. Ensure the gas cap is properly closed and free from any damage.
2. Faulty gas cap sensor: The gas cap sensor detects when the gas cap is properly closed and sends a signal to the vehicle's computer. If the sensor is faulty, it can send an incorrect signal, causing the check gas cap light to illuminate.
3. Evaporative emission control (EVAP) system problem: The EVAP system prevents fuel vapors from escaping into the atmosphere. If there is a leak or fault in the EVAP system, the check gas cap light may illuminate.
4. Other issues: In rare cases, the check gas cap light can come on due to other unrelated problems, such as a faulty fuel level sensor or a malfunction in the vehicle's computer (PCM).
If the check gas cap light remains illuminated after you have checked and tightened the gas cap, it is recommended to have your vehicle diagnosed by a trusted mechanic or a Cadillac dealership. They will be able to identify the exact cause of the problem and perform the necessary repairs.
